BMI Calculatorfor your fertility
Slide to your height and weight. See your BMI, your healthy weight and what it means for getting pregnant, for you and your partner.
Worked out on your phone. Nothing you enter is sent or saved.
What your BMI means
Your weight and your fertility, in plain words
-
Underweight
BMI Below 18.5
- For women
- Too little body fat can pause ovulation, so periods may become irregular or stop.
- For men
- Very low weight can lower sperm count.
- What helps
- A dietitian can help you gain weight gently and safely.
-
Healthy
BMI 18.5 to 24.9
- For women
- Ovulation is usually at its most regular, and pregnancy is at its safest.
- For men
- Sperm count and quality tend to be at their best.
- What helps
- Keep doing what you are doing: good food, movement and sleep.
-
Overweight
BMI 25 to 29.9
- For women
- Ovulation can become less regular and it may take a little longer to conceive.
- For men
- Sperm quality can start to dip.
- What helps
- Losing even 5 percent of your weight can help.
-
Obese
BMI 30 and above
- For women
- Hormones can be thrown off, IVF works less well and pregnancy carries more risk.
- For men
- Higher weight is linked to lower sperm count and quality.
- What helps
- Small, steady changes make a real difference, and our specialists can help.
Healthy weight chart
A healthy weight for your height
Find your height and the healthy range beside it. Your own row lights up once you have used the calculator.
| Height | Healthy weight | On a scale of 35 to 100 kg |
|---|---|---|
| 150 cm4 ft 11 in | 42 to 56 kg42 to 52 kg | |
| 155 cm5 ft 1 in | 44 to 60 kg44 to 55 kg | |
| 160 cm5 ft 3 in | 47 to 64 kg47 to 59 kg | |
| 165 cm5 ft 5 in | 50 to 68 kg50 to 62 kg | |
| 170 cm5 ft 7 in | 53 to 72 kg53 to 66 kg | |
| 175 cm5 ft 9 in | 57 to 76 kg57 to 70 kg | |
| 180 cm5 ft 11 in | 60 to 81 kg60 to 74 kg | |
| 185 cm6 ft 1 in | 63 to 85 kg63 to 78 kg | |
| 190 cm6 ft 3 in | 67 to 90 kg67 to 83 kg |
Small changes, real results
You do not need a perfect number
- 5 to 10% of your weightLosing this much can bring back regular ovulation, especially with PCOS.
- 19 to 30 BMI before IVFThe range many clinics prefer, because treatment works better and is safer.
- Both partners countA man's weight matters too: a higher BMI is linked to lower sperm count and quality.
Questions
BMI and fertility, answered
What is a healthy BMI for getting pregnant?
A BMI of 18.5 to 24.9 is the healthy range, or 18.5 to 22.9 if you use the South Asian ranges. In this range ovulation is usually regular, IVF tends to work best and pregnancy is safest.
Why are the South Asian ranges lower?
People of South Asian origin tend to carry more body fat at the same BMI, so health risks start at a lower number. That is why Indian guidelines count a BMI of 23 as overweight and 25 as obese. The calculator switches these on for visitors in South Asia, and you can change it.
Does BMI affect IVF success?
Yes. Both a very low and a high BMI are linked to fewer eggs, lower pregnancy rates and more risk in pregnancy. That is why many clinics prefer a BMI between 19 and 30 before starting treatment.
Does a man's BMI matter?
It does. A higher BMI in men is linked to lower sperm count and quality, and changes in hormones. Checking both partners together gives the fuller picture.
How much weight should I lose before trying?
Often less than people think. Losing 5 to 10 percent of your body weight can bring back regular ovulation, especially with PCOS. Slow and steady is best, and our specialists can help you plan it.
Is BMI accurate for everyone?
Not always. It does not tell muscle from fat, so it can mislead for very muscular people, and it is not used in pregnancy. Your doctor may also look at your waist and your health as a whole.
Is my information stored anywhere?
No. The calculation happens in your own browser. Your height and weight are never sent to us, never saved and never added to the page address.
One step at a time
A healthy weight is a plan, not a race.
Our fertility specialists can help you and your partner set a target that fits your life, and plan treatment around it.
